At the moment Retention Policies are only triggered on their retention age. Enhancing it with additional regular expressions (like transport/mail rules) will help manage the mailbox.
For instance: Mail to archive when retention age is 90 days, unless object has attachment the mail is moved to archive when retention age is 45 days.
(In my own mailbox, I move certain mails via a rule to a folder which has a specific retention
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Voting

Currently quarantine, block or allow, and approval for activesync devices is performed using the Set-ActiveSyncOrganizationSettings powershell cmdlet.

These features should be baked into Activesync Policies, allowing Exchange Administrators to prioritise block, quarantine and allow configurations based on the Activesync device policy a user mailbox has been set.